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Research Papers

Energy and Exergy Analysis of a Photovoltaic-Thermal Collector With Natural Air Flow

[+] Author and Article Information
A. Shahsavar, M. Gholampour

Department of Mechanical Engineering, Faculty of Engineering,  Shahid Bahonar University, Kerman, Iran; Energy and Environmental Engineering Research Center, Shahid Bahonar University, Kerman 7616914111, Iran

M. Ameri1

Department of Mechanical Engineering, Faculty of Engineering,  Shahid Bahonar University, Kerman, Iran; Energy and Environmental Engineering Research Center, Shahid Bahonar University, Kerman 7616914111, Iran

1

Corresponding author.

J. Sol. Energy Eng 134(1), 011014 (Nov 29, 2011) (10 pages) doi:10.1115/1.4005250 History: Received April 27, 2011; Revised September 21, 2011; Published November 29, 2011; Online November 29, 2011

The objective of present work is to analyze the energy and the exergy performance of a naturally ventilated photovoltaic-thermal (PV/T) air collector which is designed, manufactured and tested at a geographic location of Kerman, Iran. This PV/T collector is tested in both glazed and unglazed types. In this system, a thin metal sheet is used to improve heat extraction from the PV panels and consequently achieving higher thermal and electrical output. The metal sheet is suspended at the middle of an air channel in the studied PV/T air configuration. A theoretical model is developed and validated against experimental data, where good agreement between the predicted results and measured data is achieved. The validated model is then used to study the effect of the solar radiation, channel depth, collector length, and PV cell efficiency on total energy and exergy efficiency of the studied system.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

(a) Cross-sectional view of studied PV/T air collector. (b) Photograph of experimental setup of studied PV/T air collector at Shahid Bahonar university of Kerman

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Figure 2

Schematic of the studied PV/T air system with heat transfer coefficients

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Figure 3

The equivalent circuit for a PV generator

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Figure 4

Comparison of experimental and theoretical outlet air temperature for both glazed and unglazed types

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Figure 5

Comparison of experimental and theoretical PV panel temperature for both glazed and unglazed types

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Figure 6

Comparison of experimental and theoretical operating voltage of the PV panels for both glazed and unglazed types

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Figure 7

Comparison of experimental and theoretical operating current of the PV panels for both glazed and unglazed types

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Figure 8

Thermal, electrical and total energy and exergy efficiency for glazed system

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Figure 9

Thermal, electrical and total energy and exergy efficiency for unglazed system

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Figure 10

Variation of total energy and exergy efficiency with radiation for both glazed and unglazed systems

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Figure 11

Variation of total energy and exergy efficiency with channel depth for both glazed and unglazed systems

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Figure 12

Variation of total energy and exergy efficiency with collector length for both glazed and unglazed systems

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Figure 13

Variation of total energy and exergy efficiency with PV cell efficiency for both glazed and unglazed systems

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